Crystallisation behaviour of Polyamide-6 and Polyamide-66 nanocomposites

Hedicke, K.; Wittich, H.; Mehler, Christof; Gruber, Freddy; Altstädt, Volker

doi:10.1016/j.compscitech.2005.05.023

Cited by 51 publications

(33 citation statements)

References 19 publications

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“…Observa-se para a PA6, um pico endotérmico a 224,1 °C referente a temperatura de fusão da fase α. Quando a argila CL20A é adicionada a PA6, observa-se que há o aparecimento de um segundo pico de fusão com formato bimodal a ~212 °C, além do pico de fusão da PA6 a ~224,5 °C (fase α). De acordo com Hedicke et al [28] , este pico bimodal a baixas temperaturas, pode ser atribuído à fase γ, a qual é menos estável termicamente e que possui um pico de fusão a aproximadamente 212 °C. Quando o copolímero EG é adicionado à PA6, não há uma mudança significativa na temperatura de fusão da PA6.…”

Section: Calorimetria Exploratória Diferencial (Dsc)unclassified

Desenvolvimento de nanocompósitos a partir de blendas com matriz de PA6

Agrawal¹,

Araújo²,

Mélo³

2011

Polímeros

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Resumo: Neste trabalho foram desenvolvidos nanocompósitos de polímero/argila a partir de blendas com matriz de PA6. Inicialmente foi avaliado por reometria de torque a reatividade dos copolímeros funcionais PEgAA, PEgMA e EG com a PA6 e a influência destes no sistema PA6/argila. Os ensaios de reometria de torque mostraram que o copolímero PEgAA foi o que apresentou maior reatividade com a PA6. Já nos sistemas de PA6/Argila, o copolímero EG foi o que apresentou a maior interação com o sistema PA6/argila corroborado pelo aumento do torque em função do tempo. Os nanocompósitos foram caracterizados por Difração de Raios-X (DRX), Calorimetria Exploratória Diferencial (DSC), propriedades mecânicas e Microscopia Eletrônica de Varredura (MEV). Os resultados de DRX indicaram que o sistema PA6/CL20A apresentou estrutura intercalada enquanto que os sistemas PA6/EG/CL20A apresentaram estrutura parcialmente esfoliada. Os ensaios de DRX e DSC indicaram que no sistema PA6/EG/CL20A onde a argila foi pré-intercalada na PA6, a mesma ficou localizada na fase de PA6 enquanto que no sistema onde a argila foi pré-intercalada no copolímero EG a mesma ficou localizada na fase de EG. O sistema PA6/EG/CL20A onde a argila foi pré-intercalada na PA6 apresentou propriedades de módulo e resistência ao impacto balanceadas quando comparadas às da PA6. Os ensaios de MEV indicaram que a argila está bem dispersa nos sistemas PA6/CL20A e PA6/EG/CL20A. Palavras-chave: Poliamida 6, blendas poliméricas, nanocompósitos. Development of Nanocomposites from Blends with PA6 MatrixAbstract: In this work polymer/clay nanocomposites from blends with PA6 matrix were developed. Torque rheometry was used to evaluate the reactivity of different copolymers with PA6 and their influence on the PA6/clay system. The nanocomposites were characterized by X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), mechanical properties and Scanning Electron Microscopy (SEM). Torque rheometry analysis showed that the PEgAA copolymer exhibited the highest reactivity with PA6 while the EG copolymer showed better interaction with the PA6/Clay system. XRD results indicated that PA6/CL20A system presented intercalated structure, while PA6/ EG/CL20A systems presented a partially exfoliated structure. XRD and DSC analyses indicated that PA6/EG/CL20A system where the clay was pre-intercalated in PA6, the clay was located in the PA6 phase while in the system where the clay was pre-intercalated in the EG copolymer, the clay was located in the EG phase. The PA6/EG/CL20A system where the clay was pre-intercalated into PA6 presented balanced modulus and impact strength properties when compared to PA6. SEM tests showed that the clay is well dispersed in the PA6/ CL20A and PA6/EG/CL20A systems. Keywords: Polyamide 6, polymer blends, nanocomposites. IntroduçãoCom a crescente demanda por novos materiais, as blendas poliméricas, misturas de dois ou mais polímeros ou copolímeros, surgiram como alternativa a síntese de novos polímeros. Entretanto, como a maioria das blendas é imiscíve...

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Section: Calorimetria Exploratória Diferencial (Dsc)unclassified

Desenvolvimento de nanocompósitos a partir de blendas com matriz de PA6

Agrawal¹,

Araújo²,

Mélo³

2011

Polímeros

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“…Since the first fundamental research activities of the Toyota Research Group on the field of nanocomposites based on layered silicates [1], extensive research has been carried out at universities as well as in the industry on this subject [2][3][4][5][6]. The potential of this new class of materials is great, already small amounts (65 wt%) of organically modified layered silicates can increase tensile strength and stiffness as well as flexural strength and modulus [2,3], and in some cases also with comparable impact strength as neat polyamide-6 [2,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Novel polyamide nanocomposites based on silicate nanotubes of the mineral halloysite

Hedicke-Höchstötter

Lim

Altstädt

2009

Composites Science and Technology

139

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“…Any of the aforementioned approaches used for the estimation of the dispersive component of the surface free energy, that differ in terms of the quantity RT ln (V n ) is plotted against, can be used to determine the value of ÀDG s a , according to the method expressed in Eq. (38) and illustrated in Fig. 1.…”

Section: Quantification Of the Lewis Acid-base Interaction Capabilitymentioning

confidence: 99%

“…For instance, in polyamide (e.g. Nylon-6) matrices filled with organoclays, important changes in the crystallisation behaviour of this polymer have been reported [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Analysis of interactions in multicomponent polymeric systems: The key-role of inverse gas chromatography

Santos

Guthrie

2005

Materials Science and Engineering: R: Reports

107

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The properties of a polymeric system are a consequence of the interactions that occur between the various components of these complex systems. These components may vary significantly in terms of chemical nature (e.g. organic/inorganic), physical properties (e.g. particle size, surface area, molecular weight), structural characteristics and proportion in the formulations composition. This review paper addresses the major approaches in use regarding the analysis of the interactions that occur between the polymeric system components and the use of such approaches in the interpretation of the chemical, physical and thermodynamic properties of these systems. Special attention is given to the technique of inverse gas chromatography.A case study is presented, where use was made of inverse gas chromatography to characterize thermodynamically the surface of the major components of pigmented PC/PBT blends. The concept of Lewis acidity/basicity was used in the interpretation of the intermolecular interactions nature and potential in these blends, as encountered in phase separation and phase preferences phenomena and as expressed in the morphology, the physical and the mechanical properties of these commercially important composites. #

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Crystallisation behaviour of Polyamide-6 and Polyamide-66 nanocomposites

Cited by 51 publications

References 19 publications

Desenvolvimento de nanocompósitos a partir de blendas com matriz de PA6

Desenvolvimento de nanocompósitos a partir de blendas com matriz de PA6

Novel polyamide nanocomposites based on silicate nanotubes of the mineral halloysite

Analysis of interactions in multicomponent polymeric systems: The key-role of inverse gas chromatography

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